{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["machine or equipment", "engineering feature", "concept or principle", "process parameter", "process characterization", "manufacturing standard"], "input": "Gas tungsten arc welding ( GTAW ) provides the heat source for this new approach , combined with in-situ alloying through separate feeding of commercially pure Ti and Al wires into the weld pool ."}
{"machine or equipment": [], "engineering feature": ["alloying"], "concept or principle": ["heat source", "in-situ", "weld pool"], "process parameter": [], "process characterization": [], "manufacturing standard": []}